Transpolar Arcs and Hemispheric Asymmetry During Northward Interplanetary Magnetic Field (IMF)

向北行星际磁场 (IMF) 期间的跨极弧和半球不对称

• 批准号: 0211572
• 负责人: Judy Cumnock
• 金额: $ 24.88万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0211572&HistoricalAwards=false
• 关键词: Transpolar; Arcs; Hemispheric; Asymmetry; During

Understanding of the dynamics of the magnetosphere-ionosphere system, the coupling between the two regions, and its dependence on interplanetary conditions in particular, is of fundamental importance to almost every aspect of magnetospheric and ionospheric physics. In this project, electric and magnetic field and precipitating particle data from polar orbiting satellites such as DMSP F12, F13, F14 and F15, are used while the Polar UVI instrument provides measurements of auroral emissions. The SuperDARN radar array provides ionospheric convection maps. Ace, Wind, and IMP-8 provide solar wind velocity, density and interplanetary magnetic field (IMF) measurements. Time periods are utilized when Polar UVI provides a global view of the auroral distribution and at least two DMSP satellites measure particle properties, electric fields, and field-aligned currents in the upper ionosphere. Utilizing these data the understanding will be improved of the occurrence of trans-polar arcs (TPAs) and theta aurora in both hemispheres and the detailed plasma flows associated with them. In particular, the existence of high latitude TPAs is one of the most unusual features seen in the ionosphere and implies an unusual magnetospheric topology. The electrodynamics of TPAs is directly related to how coupling occurs between the solar wind-magnetosphere-ionosphere system during northward IMF. Analysis of the unique data set described will provide insight into simultaneous behavior and/or existence of TPA in both hemispheres and thus also into the topology of the magnetosphere.

了解磁层-电离层系统的动力学、两个区域之间的耦合，特别是它对行星际条件的依赖性，对于磁层和电离层物理学的几乎每个方面都具有根本重要性。在该项目中，使用来自 DMSP F12、F13、F14 和 F15 等极地轨道卫星的电场、磁场和沉淀粒子数据，同时 Polar UVI 仪器提供极光发射测量。 SuperDARN 雷达阵列提供电离层对流图。 Ace、Wind 和 IMP-8 提供太阳风速度、密度和行星际磁场 (IMF) 测量。当 Polar UVI 提供极光分布的全球视图并且至少两颗 DMSP 卫星测量上层电离层中的粒子特性、电场和场对准电流时，就会利用时间段。利用这些数据，将提高对两个半球跨极弧（TPA）和θ极光的发生以及与之相关的详细等离子体流的理解。特别是，高纬度TPA的存在是电离层中最不寻常的特征之一，并且意味着不寻常的磁层拓扑。 TPA 的电动力学与北向 IMF 期间太阳风-磁层-电离层系统之间如何发生耦合直接相关。对所描述的独特数据集的分析将提供对两个半球 TPA 的同时行为和/或存在的洞察，从而也了解磁层的拓扑结构。